Rmoov - http://www.rmoov.com/
Remoov’em - http://www.removeem.com/
SEO Gadget Link Clean-Up - http://tools.seogadget.co.uk/
The trust and power of each inbound link and the anchor text used can determine whether you rank for a specific keyword. Before it was simply a matter of anchor density.
Now, let’s say you have 100 links to your site using the keyword “widgets”. Your anchor density is high enough for you to rank but not so high that it would trigger a penalty. If the power and trust of those links is too low, even though your anchor density and authority are good, you will still not rank for those terms.
By removing unwanted, low quality links you have better control of the power & trust of the terms associated with your anchor text.